Depends if you want to spend money.
Your local Hire Company will do you a Kango Hammer (like a small road drill
but electric).

No cost option is a sledgehammer. Easiest way is to crack the concrete, then
lift a corner with a road spike (strong long bit of metal) & get a friend to
hit it with the hammer. It breaks up much easier this way.


"John Wakefield" wrote in message
...
What's the best thing to use for this? Sledgehammer or some sort of power
tool?